"Look, in many ways Donald Trump is like a pirate. He's outside the normal system, he gets things done, he's bold, he's actually like a figure out of a movie," the former House speaker said during an interview with Fox News' Sean Hannity. "In a lot of ways, my entire career has been a little bit like a pirate. I've taken on the establishment in both parties, [I'm] very prepared to fight in the media.

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"One of the hard questions on the way to California: Do you really want a two-pirate ticket?"

In discussing a recent meeting between himself, Trump and other contenders being vetted for the vice presidency, Gingrich noted that Trump had acknowledged to them that he had yet to make up his mind.

"A point he made at the end of our meeting to all of us, only one person knows who is going to be the vice president, and that person doesn't know yet. I thought that was a good way to put it," Gingrich said.

The former Georgia congressman also broke down how he saw himself stacking up against another vice presidential hopeful, Indiana Gov. Mike Pence, saying that while Pence would likely be a "very stabilizing force" on the Republican ticket, he would be more apt at "communicating big ideas."

"A lot of people who are a little jittery about Donald Trump would feel reassured talking with Pence, and that he could spend a good bit of July and August bringing back the party regulars and getting them inside," Gingrich said. "I think my strength is totally different. I'm an outsider, I'm oriented toward moving the great base of the party, communicating big ideas, being on television.

"So I think Trump's got to decide: Does he want a second person who's really as effective on television, or does he want somebody who's really good at reaching out on a personal basis to a lot of people who, frankly, Trump may not be able to reach on his own?"

Earlier Wednesday Trump said he had narrowed his selection pool down to "three, potentially four" names, though he implied that in reality only two contenders were likely left in his mind to choose from. The statements further muddled the outlook on the presumptive Republican nominee's thought process going into the Republican National Convention Saturday. Several of Trump's main campaign advisers are reportedly distressed that their candidate appears to be moving away from Indiana Gov. Mike Pence and toward New Jersey Gov. Chris Christie.

Trump announced late Wednesday evening on Twitter that he planned to unveil his running mate selection at 11 a.m. Friday in Manhattan. Alabama Sen. Jeff Sessions is also another possible contender.